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Chemical Engineering - Mechanical Operations

Exercise : Mechanical Operations - Section 1
1.
Short distance transportation of grain, gravel, sand, ash, asphalt etc. is done by using a __________ conveyor.
flight
slat or drag
ribbon
screw
Answer: Option
Explanation:
No answer description is available. Let's discuss.
2.
Equivalent diameter of a particle is the diameter of the sphere having the same
ratio of surface to volume as the actual volume.
ratio of volume to surface as the particle.
volume as the particle.
none of these.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
3.
If dp is the equivalent diameter of a non-spherical particle, Vp its volume and sp its surface area, then its sphericity is Φs is defined by
Φs = 6 Vp/dp sp
Φs = Vp/dp sp
Φs = 6 dp Sp/Vp
Φs = dp Sp/Vp
Answer: Option
Explanation:
No answer description is available. Let's discuss.
4.
Power required to drive a ball mill with a particular ball load is proportional to (where, D = diameter of ball mill )
D
1/D
D2.5
1/D2.5
Answer: Option
Explanation:
No answer description is available. Let's discuss.
5.
Pick out the wrong statement.
Recycled coarse material to the grinder by a classifier is termed as circulating load.
Wear and tear in wet crushing is more than that in dry crushing of materials.
Size enlargement (opposite of size reduction) is not a mechanical operation.
A 'dust catcher' is simply an enlargement in a pipeline which permits the solids to settle down due to reduction in velocity of the dust laden gas.
Answer: Option
Explanation:
No answer description is available. Let's discuss.
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